The pair made an appearance last week alongside Madonna at an Amnesty International benefit, which Pussy Riot's six members didn't agree with.

Pussy Riot explained of their shows:

"Our performances are always 'illegal,' staged only in unpredictable locations and public places not designed for traditional entertainment."

They feel that Alyokhina and Tolokonnikova went against the “ideals of our group ... feminism, separatist resistance, fight against authoritarianism and personality cult.”

"They have said in every interview that they have quit the group and no longer represent Pussy Riot. But all of their appearances are announced as appearances by Pussy Riot," said the letter.

But, um, no hard feelings?

"Yes, we lost two friends, two ideological fellow member[s], but the world has acquired two brave, interesting, controversial human rights defenders—fighters for the rights of the Russian prisoners," the letter added.

"Unfortunately, we cannot congratulate them with this in person, because they refuse to have any contact with us."